Since I've been light on time to tinker, I decided to tackle another problem that I could address quickly. When I bought the Jeep, it had no courtesy lights at all. I added a bulb to the stock footwell light, and quickly figured out there were no other light fixtures anywhere in my base model Wrangler and the light really wasn't adequate.
At work, we had some LED modules we were trying out for a new product. Once they figured out which they were going with, they were going to throw out the samples... so I took them. I used four to illuminate my Jeep. Two are in the normal footwell locations, then two are underneath the lip of the tub on either side of the rear seat. Total cost? About $1.50 for a few butt connectors.
My camera takes poor low-light pictures, but I tried to get a good comparison for the lighting before and after. The rear lighting really didn't show up well, in reality it is almost as bright as the front.